CN106032814A - Centrifugal fan - Google Patents
Centrifugal fan Download PDFInfo
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- CN106032814A CN106032814A CN201510126235.XA CN201510126235A CN106032814A CN 106032814 A CN106032814 A CN 106032814A CN 201510126235 A CN201510126235 A CN 201510126235A CN 106032814 A CN106032814 A CN 106032814A
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Abstract
The invention discloses a centrifugal fan. The centrifugal fan comprises a volute and an impeller, a volute tongue is disposed between the volute and an air outlet, a silencing barrel is in a threaded connection with the end of the air outlet, a first silencing piece is installed in the 1/2 area of the inner wall, which is at one side close to the volute tongue, of the silencing barrel, a second silencing piece is fixed in the remaining 1/2 area of the inner wall of the silencing barrel, the distance between the highest point of the first silencing piece and the inner wall of the silencing barrel is A, the distance between the highest point of the second silencing piece and the inner wall of the silencing barrel is B, and the relationship between A and B satisfies A>B. The centrifugal fan also comprises a flow baffle loop fixed on the impeller, a flow discharge gap is disposed in the impeller, and the flow discharge gap faces the lower end of the flow baffle loop. The centrifugal fan is advantageous in that, high decibel rotation noise generated by high-speed air flow effecting upon the volute tongue can be eliminated by the first silencing piece, low decibel rotation noise can be eliminated by the second silencing piece, and though differentiated processing of air flow layers with different speeds in the volute, quiet and stable output of air flow at the air outlet is ensured.
Description
Technical field
The present invention relates to ventilation installation, specifically refer to a kind of centrifugal fan.
Background technology
Centrifugal fan is mainly by impeller, casing, shaft coupling, axle.Impeller is to produce blast and the main acting parts of transmission energy；Casing is mainly used to introduce gas and discharge gas, the part kinetic energy of gas is become pressure energy simultaneously；Shaft coupling is used for connecting motor and blower fan, transmits moment；Axle installs and fixes impeller, by shaft coupling and motor.
Gas between centrifugal fan blade is when impeller rotates, obtained kinetic energy (dynamic head) by centrifugal action to discharge from impeller periphery, guiding through scroll casing shape casing, it is allowed to ventilation blower output flow, thus negative pressure is formed at impeller central position, outer gas stream is made to flow into continually supplementary, so that blower fan can discharge gas.Motor passes to draught fan impeller by axle power, impeller rotates and energy is passed to air, under the effect rotated, air produces centrifugal force, air prolongs the blade of draught fan impeller and spreads to around, now, draught fan impeller is the biggest, and the energy that air is accepted is the biggest, and namely the pressure head (blast) of blower fan is the biggest.If cutting little by big impeller, not interfering with air quantity, only can reduce blast.
But while being aerated, also can bring serious sound pollution along with producing strong noise to environment.The noise that blower fan produces in the running mainly includes the Gas-solid Coupling noise that aerodynamic noise, mechanical noise and gas and Elastic Solid System interaction produce.Wherein, aerodynamic noise accounts for 45%, and mechanical noise accounts for 30%, and Gas-solid Coupling noise accounts for 25%.Aerodynamic noise mainly includes rotational noise and vortical noise, air power noise in ventilation blower is exactly the result that both are overlapped mutually, when blower fan rotates, blade path exit on rotary blade, stream pressure vertically all varies widely with air velocity, when the gap of snail tongue Yu blade exit edge part is less, when the blade path of rotation skims at snail tongue, arising that periodic pressure and velocity fluctuation, the produced noise of pulsation is referred to as rotational noise.Rotational noise not only pollutes environment, and also can affect the stability that impeller works, and the most how to solve rotational noise particularly important.
Summary of the invention
It is an object of the invention to provide a kind of centrifugal fan, the Rotation Noise produced when reducing blower fan operating, and then reach protect environment and improve the purpose of blower fan job stability.
The purpose of the present invention is achieved through the following technical solutions:
A kind of centrifugal fan, including spiral case and the impeller that is fixed in spiral case, the both sides of described spiral case offer the air inlet of horizontal direction and the air outlet of vertical direction respectively, snail tongue it is provided with between described spiral case and air outlet, connect in described air outlet end thread and have hush pipe, on hush pipe 1/2nd inwall of described snail tongue side, the first acoustic element is being installed, remaining 1/2nd inwalls of hush pipe are fixed with the second acoustic element, the longitudinal section of described first acoustic element and the second acoustic element is circular arc, and first distance away from hush pipe inwall of the peak of acoustic element be A, the peak of the second acoustic element distance away from hush pipe inwall is B, and meet A ＞ B；Also include the baffle circle being fixed on impeller, impeller has earial drainage gap, and just lower end to baffle circle, described earial drainage gap.During blower fan work, the air speed-raising that air inlet is poured into by wheel rotation, it is made quickly to be discharged by air outlet, in the operation process of impeller, the particularly blade path exit on rotary blade, stream pressure vertically all varies widely with air velocity, when the gap of snail tongue Yu blade exit edge part is less, when the blade path rotated skims at snail tongue, arise that periodic pressure and velocity fluctuation, pulsation can produce rotational noise, and rotational noise can be discharged from air outlet with air-flow runner along spiral case, environment around severe contamination blower fan；
When the present invention works, the air that outside is poured into by impeller quickly moves the air outlet to blower fan, and the rotational noise that gas shock snail tongue produces simultaneously is discharged by air outlet the most therewith；nullThe Rotation Noise of outwards transmission can be processed by the hush pipe threadeded with air outlet，The air-flow speed of service at vane edge close in spiral case is for the air-flow at spiral case inwall，Its speed significantly increases，Therefore on 1/2nd inwalls of hush pipe, it is fixed with the first acoustic element，Remaining 1/2nd inwalls of hush pipe are fixed with the second acoustic element，The longitudinal section of the first acoustic element and the second acoustic element is circular arc，And first distance A away from hush pipe inwall of the peak of acoustic element more than distance B away from hush pipe inwall of the peak of the second acoustic element，Comparatively speaking，The Rotation Noise of the high-decibel that the air-flow of speed produces with snail tongue effect can be eliminated by the first acoustic element that thickness is bigger，And the Rotation Noise of the low decibel that slow air-flow produces with snail tongue effect can be eliminated by less the second acoustic element of thickness，By the differentiation of the airflow layer of friction speed in spiral case is processed，To avoid being polluted environment by the Rotation Noise entrained by air outlet air-flow，Improve the efficiency that noise reduction processes simultaneously，Ensure the quiet output smoothly of the air-flow at air outlet；
Wherein, during the baffle circle being fixed on impeller can reduce, the eddy current crack of low pressure centrifugal blower fan, because the Casing width of this type of blower fan and impeller outlet width are generally large, the diffusion degree that air-flow enters spiral case from impeller becomes big, can produce large scale whirlpool with spiral case part outside dish before the impeller, can be attended by the generation of vortex flow noise simultaneously, the present invention offers earial drainage gap on impeller and matches with baffle circle, the large scale eddy current produced can be eliminated, and then the generation of noise in reduction spiral case.
Further, described first acoustic element and the second acoustic element are sponge, tapetum fibrosum or aluminium silicate wool.As preferably, the first acoustic element and the second acoustic element all use the material that erasure effect is good, i.e. sponge, tapetum fibrosum or aluminium silicate wool, by processing the absorption of Rotation Noise at air outlet, and then reach the quiet output smoothly of the air-flow at fan outlet.
Further, described snail tongue is short tongue, and the distance that snail tongue is away from impeller peak is s, and the excircle of the impeller distance away from spiral case top inwall is S, and meets 0 ＜ s ＜ S.Snail tongue refers to that the junction of centrifugal ventilator volute and gas outlet often has one to be formed by shell wall, " ligule " structure of shape such as tongue, its effect is used to placement part gas at spiral case internal circulation flow, time near the gas flow sweep snail tongue in impeller passage exit, the tip of the tongue of snail tongue breaks it into two: major part air-flow has flowed to the outlet of blower fan along passage；Small part air-flow then flows back to spiral case by the gap between snail tongue, impeller, rotates with impeller and return to, after reaching one week, the shunting that at snail tongue, participation is new in spiral case.Wherein, snail tongue includes flat tongue, short tongue, deep tongue and point tongue, the i.e. corner dimension by being formed between shell wall and the shell wall of air outlet of spiral case body judges, and angle is in the range of 0 ~ 180 °, snail tongue is set to short tongue by the present invention, because its efficiency curve is relatively flat, economic work region is wider, is therefore applicable to the blower fan carrier of stability output；And the distance that snail tongue is away from impeller peak is s, the excircle of the impeller distance away from spiral case top inwall is S, meet 0 ＜ s ＜ S simultaneously, between snail tongue and impeller, i.e. form a ventilation gap, ventilation gap width is s, in region, impeller passage exit, air-flow can produce stronger pressure fluctuation in ventilation gap, form also impeller blade and pass through effective acoustic radiation of frequency and its harmonic wave, when this ventilation gap increases, the axial VELOCITY DISTRIBUTION of air-flow is the most smooth, therefore the amplitude of the pressure fluctuation at snail tongue also can reduce, i.e. reduce Rotation Noise；This ventilation gap can not be excessive simultaneously, and after ventilation gap increases to a certain degree, noise no longer declines, and excessive ventilation gap can make the aeroperformance of blower fan reduce on the contrary, therefore the scope of s is determined in the range of 0 ~ S.
The present invention compared with prior art, has such advantages as and beneficial effect:
1, the Rotation Noise of the high-decibel that the air-flow of speed produces with snail tongue effect can be eliminated by the first acoustic element that in the present invention, thickness is bigger, and the Rotation Noise of the low decibel that slow air-flow produces with snail tongue effect can be eliminated by less the second acoustic element of thickness, by the differentiation of the airflow layer of friction speed in spiral case is processed, to avoid being polluted environment by the Rotation Noise entrained by air outlet air-flow, improve the efficiency that noise reduction processes, it is ensured that the quiet output smoothly of the air-flow at air outlet simultaneously；
2, the present invention the first acoustic element and the second acoustic element all use the material that erasure effect is good, i.e. sponge, tapetum fibrosum or aluminium silicate wool, by processing the absorption of Rotation Noise at air outlet, and then reach the quiet output smoothly of the air-flow at fan outlet；
3, the present invention is in region, impeller passage exit, air-flow can produce stronger pressure fluctuation in ventilation gap, impeller blade is by frequency and effective acoustic radiation of its harmonic wave, when this ventilation gap increases, the axial VELOCITY DISTRIBUTION of air-flow is the most smooth, therefore the amplitude of the pressure fluctuation at snail tongue also can reduce, and i.e. reduces Rotation Noise；.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes the part of the application, is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of one specific embodiment of a kind of centrifugal fan of the present invention；
Fig. 2 is the sectional view of one specific embodiment of a kind of centrifugal fan of the present invention；
Fig. 3 is the structural representation of one specific embodiment of silencing pot in a kind of centrifugal fan of the present invention；
Labelling and corresponding parts title in accompanying drawing: 1, spiral case, 2, air inlet, 3, air outlet, 4, impeller, 5, snail tongue, 6, hush pipe, the 7, first acoustic element, the 8, second acoustic element, 9, baffle circle, 10, earial drainage gap.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and the exemplary embodiment of the present invention and explanation thereof are only used for explaining the present invention, not as a limitation of the invention.
Embodiment 1
As shown in Figure 1 to Figure 3, the present embodiment includes spiral case 1 and the impeller 4 being fixed in spiral case 1, the both sides of described spiral case 1 offer the air inlet 2 of horizontal direction and the air outlet 3 of vertical direction respectively, it is provided with snail tongue 5 between described spiral case 1 and air outlet 3, connect in described air outlet 3 end thread and have hush pipe 6, on hush pipe 1/6th two inwall of described snail tongue 5 side, the first acoustic element 7 is being installed, remaining 1/2nd inwalls of hush pipe 6 are fixed with the second acoustic element 8, the longitudinal section of described first acoustic element 7 and the second acoustic element 8 is circular arc, and first distance away from hush pipe 6 inwall of the peak of acoustic element 7 be A, the peak of the second acoustic element 8 distance away from hush pipe 6 inwall is B, and meet A ＞ B；Also include the baffle circle 9 being fixed on impeller 4, impeller 4 has earial drainage gap 10, and just lower end to baffle circle 9, described earial drainage gap 10.
When the present invention works, the air that outside is poured into by impeller 4 quickly moves the air outlet 3 to blower fan, and the rotational noise that gas shock snail tongue 5 produces simultaneously is discharged by air outlet 3 the most therewith；nullThe Rotation Noise of outwards transmission can be processed by the hush pipe 6 threadeded with air outlet 3，In spiral case 1 near the air-flow speed of service of impeller 4 edge for the air-flow at spiral case 1 inwall，Its speed significantly increases，Therefore on 1/2nd inwalls of hush pipe 6, it is fixed with the first acoustic element 7，Remaining 1/2nd inwalls of hush pipe 6 are fixed with the second acoustic element 8，The longitudinal section of the first acoustic element 7 and the second acoustic element 8 is circular arc，And first distance A away from hush pipe 6 inwall of the peak of acoustic element 7 more than distance B away from hush pipe 6 inwall of the peak of the second acoustic element 8，Comparatively speaking，The Rotation Noise of the high-decibel that the air-flow of speed produces with snail tongue 5 effect can be eliminated by the first acoustic element 7 that thickness is bigger，And the Rotation Noise that less the second acoustic element 8 of thickness can act on the low decibel produced to slow air-flow and snail tongue 5 eliminate，By the differentiation of the airflow layer of friction speed in spiral case 1 is processed，To avoid being polluted environment by the Rotation Noise entrained by air outlet 3 air-flow，Improve the efficiency that noise reduction processes simultaneously，Ensure the quiet output smoothly of the air-flow at air outlet 3；
Wherein, during the baffle circle 9 being fixed on impeller 4 can reduce, the eddy current crack of low pressure centrifugal blower fan, because the spiral case of this type of blower fan 1 width and impeller outlet width are generally large, the diffusion degree that air-flow enters spiral case 1 from impeller 4 becomes big, large scale whirlpool can be produced with spiral case 1 outside impeller 4 shroud, the generation of vortex flow noise can be attended by simultaneously, the present invention offers earial drainage gap 10 on impeller 4 and matches with baffle circle 9, the large scale eddy current produced can be eliminated, and then the generation of noise in reduction spiral case 1.
As preferably, first acoustic element 7 and the second acoustic element 8 all use the material that erasure effect is good, i.e. sponge, tapetum fibrosum or aluminium silicate wool, by processing the absorption of Rotation Noise at air outlet 3, and then reaches the quiet output smoothly of the air-flow at fan outlet 3.
Snail tongue 5 is set to short tongue by the present invention, and because its efficiency curve is relatively flat, economic work region is wider, is therefore applicable to the blower fan carrier of stability output；And the distance that snail tongue 5 is away from impeller 4 peak is s, the excircle of impeller 4 distance away from spiral case 1 top inwall is S, meet 0 ＜ s ＜ S simultaneously, between snail tongue 5 and impeller 4, i.e. form a ventilation gap, ventilation gap width is s, in impeller 4 channel exit region, air-flow can produce stronger pressure fluctuation in ventilation gap, form also impeller 4 blade passing frequency and effective acoustic radiation of its harmonic wave, when this ventilation gap increases, the axial VELOCITY DISTRIBUTION of air-flow is the most smooth, therefore the amplitude of the pressure fluctuation at snail tongue 5 also can reduce, i.e. reduce Rotation Noise；This ventilation gap can not be excessive simultaneously, and after ventilation gap increases to a certain degree, noise no longer declines, and excessive ventilation gap can make the aeroperformance of blower fan reduce on the contrary, therefore the scope of s is determined in the range of 0 ~ S.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the detailed description of the invention of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (3)
- null1. a centrifugal fan，Including spiral case (1) and the impeller (4) that is fixed in spiral case (1)，The both sides of described spiral case (1) offer the air inlet (2) of horizontal direction and the air outlet (3) of vertical direction respectively，It is characterized in that: between described spiral case (1) and air outlet (3), be provided with snail tongue (5)，Connect in described air outlet (3) end thread and have hush pipe (6)，On hush pipe (6) 1/2nd inwall of described snail tongue (5) side, the first acoustic element (7) is being installed，Remaining 1/2nd inwalls of hush pipe (6) are fixed with the second acoustic element (8)，Described first acoustic element (7) is circular arc with the longitudinal section of the second acoustic element (8)，And first distance away from hush pipe (6) inwall of the peak of acoustic element (7) be A，The peak of the second acoustic element (8) distance away from hush pipe (6) inwall is B，And meet A ＞ B；Also include the baffle circle (9) being fixed on impeller (4), impeller (4) has earial drainage gap (10), and just lower end to baffle circle (9), described earial drainage gap (10).
- A kind of centrifugal fan the most according to claim 1, it is characterised in that: described first acoustic element (7) and the second acoustic element (8) are sponge, tapetum fibrosum or aluminium silicate wool.
- A kind of centrifugal fan the most according to claim 1 and 2, it is characterized in that: described snail tongue (5) is short tongue, and the distance that snail tongue (5) is away from impeller (4) peak is s, the excircle of impeller (4) distance away from spiral case (1) top inwall is S, and meets 0 ＜ s ＜ S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126235.XA CN106032814A (en) | 2015-03-21 | 2015-03-21 | Centrifugal fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126235.XA CN106032814A (en) | 2015-03-21 | 2015-03-21 | Centrifugal fan |
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| CN106032814A true CN106032814A (en) | 2016-10-19 |
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| CN201510126235.XA Pending CN106032814A (en) | 2015-03-21 | 2015-03-21 | Centrifugal fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931638A (en) * | 2017-04-01 | 2017-07-07 | 烟台通天达风机制造有限公司 | Cumulative heat high-temperature warm air machine |
| CN107965475A (en) * | 2017-05-09 | 2018-04-27 | 宁波方太厨具有限公司 | A kind of noise reducing type radial fan |
-
2015
- 2015-03-21 CN CN201510126235.XA patent/CN106032814A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931638A (en) * | 2017-04-01 | 2017-07-07 | 烟台通天达风机制造有限公司 | Cumulative heat high-temperature warm air machine |
| CN106931638B (en) * | 2017-04-01 | 2023-03-10 | 烟台通天达风机制造有限公司 | Energy-gathered heat generation high-temperature air heater |
| CN107965475A (en) * | 2017-05-09 | 2018-04-27 | 宁波方太厨具有限公司 | A kind of noise reducing type radial fan |
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Application publication date: 20161019 |